export default{
  namespaced:true,
  state:() => ({
    // 购物车数组 用来存储购物车中每个商品的信息对象
    // 每个商品的信息对象 都包含如下6个属性
    // {goods_id,goods_name,goods_price,goods_count,good_small_logo,googs_state}
    cart:JSON.parse(uni.getStorageSync('cart') || '[]'),
  }),
  mutations:{
    addToCart(state,goods){
     const findResult =   state.cart.find(x => x.goods_id === goods.goods_id)
      if(!findResult){
        state.cart.push(goods)
      }else{
        findResult.goods_count++
      }
      this.commit('m_cart/saveToStorage')
    },
    // 将购物车中数据持久化
    saveToStorage(state){
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    // 更新购物车中勾选的状态
    updateGoodsState(state,goods){
    const findResult = state.cart.find(x =>x.goods_id === goods.goods_id)
      if(findResult){
        findResult.goods_state = goods.goods_state
        this.commit('m_cart/saveToStorage')
      }
    },
    // 更新商品的数量
    updateGoodsCount(state,goods){
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      if(findResult){
        findResult.goods_count = goods.goods_count
        this.commit('m_cart/saveToStorage')
      }
    },
    // 根据id删除对应的商品
    removeGoodsById(state,goods_id){
    state.cart = state.cart.filter(x => x.goods_id !== goods_id)
    this.commit('m_cart/saveToStorage')
    },
    // 选中全选商品全选
    updateAllGoodsState(state,newState){
      state.cart.forEach(x => x.goods_state = newState)
      this.commit('m_cart/saveToStorage')
    }
  },
  getters:{
    // 购物车中 所有商品的总数量
    total(state){
      // let c = 0
      // state.cart.forEach(x => c += x.goods_count)
      // return c
    return  state.cart.reduce((total,item) => total += item.goods_count,0)
    },
    // 勾选商品的总数量
    checkedCount(state){
      return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count, 0)
    },
    // 已勾选的商品总价格
    checkedGoodsAmount(state){
    return  state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count * item.goods_price,0).toFixed(2)
    }
  }
}